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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended
	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) resulting from the change in the fair value of investments		$ 47.8
Geothermal Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity and debt securities	$ 2.7	$ 11.8
ADNOC Drilling
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments to acquire investments	$ 100.0
Investment balance (in shares)	159.7
Ownership percentage	1.00%
Investments lockup period	3 years

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
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-Section 50
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Balance held at close of period in number of shares.

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-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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